Input 3D line segments from real scientific data
If I understood what you where trying to do well, the best way to create the segments is to use curve object output. With the Spline from points node, you can connect all you file data into the two vectors for the object, and animate them by using the method shown in the question can object parameters be set from data file.



(In the image I let the vector inputs free)

Then you can create a loop or a group to repeat the process and create plenty of splines (segments)